BU21025GUL Datasheet, PDF (1/19 Pages) Rohm – 4-wire Resistive Touch Screen Controller

Datasheet
4-wire Resistive
Touch Screen Controller
BU21025GUL
●General Description
BU21025GUL is a low power 4-wire resistive touch
screen controller. BU21025GUL measures coordinates
and touch pressures with a 12bit A/D converter.
BU21025GUL has a digital filter for noise reduction.
●Features
■ 4-wire resistive touch screen controller
■ Single 1.65V to 3.60V supply.
■ Low standby current ( 0.8uA max)
■ 12bit SAR A/D converter
■ 2-wire serial interface
■ Command base interface
■ Digital filter
■ Touch pressure measurement
■ Auto power down control
■ Built-in clock oscillation circuit
●Key Specifications
■ Power supply voltage
■ Temperature range
■ Standby current
■ Operating current
■ Coordinate resolution
1.65V to 3.60V
-30℃ to 85℃
0.8uA (Max.)
120uA (Typ.)
12Bits
●Package
VCSP50L2
W (Typ.) x D (Typ.) x H (Max.)
2.00 mm x 1.50 mm x 0.55mm
●Applications
■ Equipment with a built in user interface of 4-wire
resistive touch screen
■ Portable device such as smart phone, tablet, PDA.
■ Digital still camera, digital video camera, portable
TV.
■ PC / PC peripheral equipment such as laptop PC,
touch screen monitor, printer.
●Typical Application Circuit
VDD
3
1.0μF 0.1μF
GND
Auxilary Input
10Ω
10Ω
0.1μF
0.1μF
AUX
XP
YP
Touch
Screen
1
10Ω
XN
0.1μF
YN
10Ω
0.1μF
5
GND
4
1. 4-wire resistive touch screen
2. Pull-up resistor for 2-wire serial interface
3. Bypass capacitors
4. Diodes for EDS protection
5. Low pass filter for noise reduction
BU21025
GND
2
SDA
2.2kΩ
2.2kΩ
Master
( 2-wire serial
interface )
SDA
SCL
SCL
INT
GPIO
AD1
AD0
GND
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
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© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0Y2Y0F300050-1-2
7.AUG.2012 Rev.002